1. If the stairs are preset in the house design, the stairs and the upper and lower floors can be regarded as connecting stairs. At this time, the stairs are a part of the building structure, which is responsible for the safety of bearing. Do not dismantle the stairs at will. This will affect the function of the house.

2. In order to establish the connection between the stairs and the structure, only the reserved holes should be "elastic". At present, most of the stairs have no reserved stair foundation, which needs to be built by the construction team itself. If you need to add stairs to an existing two-story building, the stairs will not become part of the building structure.

Don't put too much pressure on the stairs. Simple feeling, the stairs are safe and stable. Therefore, there will be misunderstandings and impressions, and it is heavier and safer to install the stairs in the reserved holes. In fact, adding something to the building structure is not considered in the design of the building. Incorrect operation will change the strength of the building, which is particularly unfavorable to the safety of the building.